Pivoted stop valve



Sept. 22, 1953 o. scHNYDER PIVOTED STOP VALVE vFiled. Feb. 2l, 1947 /5a.Ma, /6

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Patented Sept. 22, 1953 UNITED STATES PAT ENIT oF-Flfc:

PIVOTED STOPW/"ALVE,`

Othmar S'chnyder, Klus', Switzerlancil,,assignonto` Gesellschaft der..Ludw. von1Rllsch'en' Eisen--A Werke A; G., GerlafingengwitzerlandApplicationFebruary 21, 1947 S erial N oi- 730,038 s In -SxF/itzerlandOctober. 7, 19424' Section'l, PublicLaw 690, August 8,;1946 Patentexpires October 7, 1962* (Cll` 251-103) fClaim's'. 12

Mypresent' invention relates'to improvements, in general," in pipe-linestop'valvesoithe pivoted cylindrical type and in particularintliepaclring.- arrangement' therefor, and tnef main object'. of myimprovements-is to aordfacilities permitting of removing and replacingtheV defective I packing Without' the necessity of draining' the pipeline nor of providing an auxiliary'stop valve, norV of removingtrie-stop valve.

Pipe-linestcp valves are known in 4trie art; the packing means of whichmay be removed and replacedfwiticout the necessity of removingthe valverom-the'pipeline Such prior valves; however', have thev disadvantagethat, for the purpose ofinspeoting, removing and replacingrtliepack;ing; tliefupstrearn pipe line'has to be'drainedor anauxiliary-fstopi-valve be provided therein.`

In tlievalve accordingto my present'invention, now, such disadvantage'oiprior artis eliminated providing; aside from vtbe customary. orpripacirin'g-arrangement', anauxiliary or secondarypacking-arrangementwhich' is' takeninto operation when rernovingrthe.`primary packing'- rrangernent: By.' the use? of: such .,secondary.'arerangement, therefore, th'efupstream pipeeline Ldoes not? have to be`drainednor an auxiliary stop .Valve bei providedY for;

Such' auxiliary or. secondary packing-arrangement:alsoirnay.'comprise` ametal ring ancha gas- 1met madei'of highly. elastic. material;projectingover,.tnerormeriring a secondrmetal ring mounted movable: inthe: valvecase: cora-sting; with the said .two rings; Such. latter sealing;arrangement rendersthe auxiliary or secondary packing mea-nsparticniarlyfeffective;

Two forms of my presenta invention are.. shown in" the. accompanyingdrawing` in Figs. 1- andfZ respectively, showing a"longitudinalseotioneach.

As seenirom Fig. 1, showing.' thevalvein its clcscd'position, the valvecase comprises-tivoportions i', 2. Thevalve body 3, which isz'of tubularshape, `is'pvoted intliesaid case, itsfaxiszof rotation extendingyat'right angles to the-.pipefline axis. The -two packing rings d, 5-aresecured4 to body 3, e. g; by means ofa detachable screwconnection. Thesealing faceslof rings i; 5r lie, in iznownfmanner, on the surface ofafsphere,.the center of which coincides-witnthe point ofinter.- sectionofi pipe-line axis andaxisoff rotation of body The ringsi, 'i which,incontra-distinctionito ringsrlmounted. onbody 3, arefdisplaceable orslideable rings and. are. suitably mounted-in case I', l2, .may beuniformly pressed#- in tn'e direction of the' pipe-line` axis-againstrings' il, 5", e; g. by means of a suitable control.

pressure medium, sucii as Water 4introduced"into chambers Il, i9"behindrings 6; i', respectively, which pressure"rnedilurnissuppiiedtiirough confduits-'151; l5`a, valve' means le andv duct It? fordisplacing auxiliaryisealing: ring 6; and through. conduitfi;valvemeansZTi; condnitsZ and duct 30-for displacing main sealing ringthustattainingfaperfect seal. 'Ihe-fmovable service packing ring 'ifand: the auxiliary/packing ring E2 may be controlled: in known Lmann'er"by' ak suitable :duid pressure' medium; for' example, as disclosed' inSwiss Patent' No. 131;'734. Supplyfof pressure me.- dium toauxiliarypackingl ring'f may be control-led'byr means oiivalve'meansllprovided. with afturnable` control'cock Mag'. Control ValveimeansUil-is connectedwith the pressure pipe Z5. on the upstreamfside ofthevalvef l lby means of' conduit l5? and `loranchconduit Il 5a; andwiththe annular chamber l 'Vdisposedirearwardly off movable auf:-iliary'packingfringby means of duct 1S. Valve porti! 8 opensrintotheffree atmosphere-and serves as venting means-in almanner to be morefully described lli'ereinbelow: Supply. of! pressure medium torthe.'main'service'packing ring 'E1 may be controlled .by means .ofrlva'lv'emeans 2'! similar to valve means; I4 and;v provided with" a: tui'nablecontrolioocic'la, .tlie'pressure4 medium' beingfsupplied.' to annular'.chairrbert Ivon the: downstream side'. ofringlthroughv conduit. i5',valve, means 2l, conduit 29rand`ductzii0'. Control valve means 2T is:alsoap-roviflecl.1i/Vithr a-.venting port` 2BV which opens into `the:free atmosphere. Rings t; i, which preferably,are-:maderotmetaL areguided; inside, onfringeliners 8, 9-monntedfin casefl, 2, and outside,within the latter.

In the sealing4 arrangement described, tbe-upstream rings-,l, Gserve asemergency seal, and theedownstream .rings 5, l, as common or serviceseal. When, now, the latter has to be removed or replaced, the controlcock. l da is *.turned ninety degrees ina'. clockwise direction, from.its normal operative;positionillustrated in Fig, 1, whereupon duet .itis brought into communication with pressure conduitI5through.branch-conduit ld, insteadof. being'. vented tothe atmospherethrough ventingport |31 (only theiatter. position being illustrated in..Fig.. 1l) Annular. chamber di is thus placednnderpressure,siiriultaneonsly` forcingiauxili'ariy,packingring- E underpressure into operative. sealing .engagement .against ixed ring Il'.Inord'er to. relieve the. pressure Withinthe annular chamber. lilipreiiminary to inspection and'removal ofimain packingring` l,control'cock E'iaf'ofvalve l? is now turnedninetydegrees'in acounter;clockwise-` direction fromw the. position illustrated nFig 1whereupon duct'SU isbrougiit into communication" Witlr'valveport` 28;thereby venting chamber I9. Upon the release of pressure within chamberI9, the displaceable service packing ring 'I will retract slightly fromits normal operative sealing position illustrated in Fig. 1 and will nolonger seal chamber I9 since it has been brought out of sealingengagement against fixed ring 5. The condition of the service sealingjoint 5, I and the auxiliary sealing joint A, 6 is now the reverse ofthat shown in Fig. 1. Ring 6 is maintained in firm pressed engagementagainst xed ring 4 to thereby seal pipe 20, while a small gap is nowdefined between fixed ring and the service packing ring 'L As aconsequence, the expansion element IU may be removed, whereupon the ringliner 9 may be slacked and removed together with movable ring 1. Ring 5also may be detached from body 3 and removed. After completion of repairor replacement of rings 5 and/or 1, valve 2 may be reassembled andannular chamber I9 is again placed under pressure by restoring valvecock 27a to the position of Fig. 1. After having turned valve cock I 4athe pressure existing in pressure pipe now forces retraction ofauxiliary packing ring 6 within chamber I'I, thereby causingre-establishment of the gap 2| between said auxiliary packing ring andfixed ring 4 while the main packing ring 'i is rmly pressed intoengagement against fixed ring 5, thereby sealing pipe 2li. Since in theclosed position of the valve 2 (illustrated in Fig. 1), the samepressure prevails on both the upn stream and downstream sides of therings Il and 6, now flow occurs through the annular gap ZI, andaccordingly rings 4 and 6 are not subjected to wear. This feature of thepresent invention is a considerable advantage over valves ofconventional design, wherein no annular gap is provided between thepacking rings on the inlet side of the valve. The absence of such a gap,together with the fact that the pressure on the downstream side of thepacking rings at the inlet side of the valve is less than in thepressure pipe, is a distinct disadvantage, since a grain of sand or evena mere scratch on the sealing surface of the valve parts suices to causeow past the engaged sealing surfaces, which undesirable flow results inprogressive deterioration of the packing rings on the inlet side of thevalve and ultimately renders the valve mechanism useless.

Rings 5, I of the common or service seal preferably are made of acorrosion-proof metal. II'he movable ring 6 of the emergency seal,however, in many cases may be made of a cheaper material, e. g. rubber.

In the embodiment according to Fig. 2, valve body 3 is journaled incasing portion I. The erection seal shown comprises a metal ring 4secured to body 3. A second ring I2 made of a soft and elastic material,e. g. rubber, is inserted into an annular groove I I of ring li, andslightly projects beyond the sealing face of the latter. A metal ring 5,mounted axially displaceable in valve-casing portion I, co-acts with thetwo rings 4 and I2. Ring 6 is guided inside by ring liner 8, and may beuniformly pressed against rings 4, I2, by means of a pressure iiuid, forexample, by control pressure water, said pressure fluid being introducedinto chamber I'l behind auxiliary sealing ring 6 through conduit I6.During such latter operation, ring 6 first contacts ring I2 which ismade of soft and elastic material, and compresses same, the materialthereof being cap-able of yielding laterally into the recesses I3 ingroove II. Ring 5 subsequently may be pressed with still suicientsealing force onto ring 4.

The service seal is not shown in Fig. 2, being adapted similar as in theexample of Fig. 1.

Although two specific embodiments of the invention have been describedand shown in the drawing, it should be noted that the invention may berealized in modied form and adaptations of the arrangements hereindisclosed may be made, as may readily occur to persons skilled in theart without constituting a departure from the spirit and scope of theinvention as defined in the objects and in the appended claims.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent, is:

l. A hollow valve body having opposed inlet and outlet passagesconnected to a pressure fluid inlet conduit and a removable expansionelement leading to an outlet conduit, respectively, c0mprising arotatable plug member mounted in said valve body for controlling flow ofsaid pressure iiuid through the latter, first cooperable sealing meansmounted within said outlet passage and on said plug member, said firstcooperable sealing means being provided with nrst annular piston meansslidably guided within said valve body and having a first end wall whichin retracted position of said first piston means lies substantiallyflush with an adjacent portion of the inside surface of said valve body,and first ring means having a second end wall conformed to and sealinglyengaged with said first end wall when the latter projects beyond theinside surface of said valve body, to thereby shut off flow of pressurefluid through said outlet passage second cooperable sealing meansmounted within said inlet passage and on said plug member, said secondcooperable sealing means being provided with second annular piston meansslidably guided within said valve body and having a third end wall whichin retracted position of said second piston means lies substantiallyflush with an adjacent portion of the inside surface of said valve body,second ring means having a fourth end wall conformed to said third endwall, said second ring means being adapted to sealingly engage saidthird end wall of said second piston means when the latter projectsoutwardly beyond the inside surface of said valve body, duct meansconnected to said inlet conduit, and valve means in said duct means forconducting pressure fluid alternately against said first and secondpiston means and simultaneously and respectively permitting relief ofpressure against said second and said rst piston means, whereby whensaid second piston means projects beyond the inside surface of saidvalve body flow of pressure fuid through said inlet passage is shut offand said first sealing means may be replaced without draining said inletconduit or removing said valve body from the latter, and whereby whensaid second piston lies substantially flush with the inside surface ofsaid valve body, pressure of fluid located within said inlet conduitpast said second sealing means and downstream. thereof within said valvebody is equalized to thereby prevent destruction of said second sealingmeans, and said rst sealing means shuts off flow of pressure fluidtherethrough.

2. A hollow valve body according to claim 1, wherein said secondcooperable sealing means is further provided with resilient contactmeans removably mounted on said fourth end wall, whereby detsruction ofsaid resilient contact means is prevented although flow of pressurefluid through said valve body is shut off.

3. A valve structure having opposed inlet and outlet passagewaysconnectable to pressure fluid inlet and outlet conduits; comprising avalve housing, a removable expansion element between said valve housingand said outlet conduit, plug means mounted for rotation in said valvehousing and for controlling flow of said pressure iiuid through saidValve housing, respective cooperable sealing means mounted within saidinlet and outlet passageways and on said plug member, said sealing meansincluding annular piston means guided for movement between a pluralityof predetermined positions and located within said Valve housing, saidsealing means further including ring means engageable with said annularpiston means in a rst position of the latter to thereby shut off flow ofpressure iluid through said outlet passageway and to facilitate removalof said expansion element from said outlet conduit, duct means leadingoutside said valve housing and adapted for communication with said inletconduit and said annular piston means, Valve means in said duct meansfor controlling ow of pressure uid to said piston means, to therebypermit relief of pressure by said pressure fluid against at least one ofsaid piston means, whereby when said one piston means of one of saidsealing means is in a second position flow of pressure fluid throughsaid inlet passageway is shut oil and another of said sealing means maybe replaced Without draining said inlet conduit and removing said valvehousing from the latter,

whereas when said one piston means is in a third position pressure ofiiuid located within said inlet conduit past said one sealing means anddownstream thereof within said valve housing is equalized, thuspreventing destruction of said one sealing means, while said othersealing means shuts off flow of pressure fluid through said valvehousing into said expansion element and said outlet conduit, andresilient Contact means incorporated in at least one of said ring meansfor cooperation with the respective sealing means.

OTHMAR SCHNYDER.

References Cited in the le of this patent UNITED STATES PATENTS NumberName Date 769,831 Ogden Sept. 13, 1904 783,953 Henry Feb. 28, 19051,476,344 McGee et al. Dec. 4, 1923 1,879,481 Putnam Sept. 27, 19321,954,018 Miller Apr. 10, 1934 2,091,618 Szabo Aug. 31, 1937 2,233,074Corbin Feb. 25, 1941 2,357,232 Snyder Aug. 29, 1944 FOREIGN PATENTSNumber Country Date 131,734 Switzerland of 1929 174,749 Switzerland of1935 174,750 Switzerland of 1935 520,188 Germany of 1931

